Dr. Deborah Hasin is Professor of Clinical Epidemiology at Columbia University in the College of Physicians and Surgeons, Department of Psychiatry, with a joint appointment in the Mailman School of Public Health, Department of Epidemiology. She is director of the NIDA-funded Substance Abuse Epidemiology Training Program (SAETP) at Columbia University. Dr. Hasin received her Ph.D. in epidemiology from Columbia University in 1986. She studies drug use, drug use disorders and comorbidity in the general population and in patient groups, including veterans. Her studies focus on large-scale social influences on rates of cannabis use and cannabis-related harms, and on concepts and measures of addiction across psychoactive substances. Dr. Hasin has published over 500 papers. Her studies have been funded by the U.S. National Institute on Drug Abuse and the National Institute on Alcohol Abuse and Alcoholism since 1990.